You can dock a SpaceX Crew Dragon at the space station in this free simulator

It’s harder than it looks…

If you always wanted to pilot a spaceship, here’s your big chance to simulate the experience.

SpaceX released an International Space Station docking simulator that is very close to the real thing that Crew Dragon astronauts may experience starting on the test flight scheduled for May 27.

“This simulator will familiarize you with the controls of [the] actual interface used by NASA astronauts to manually pilot the SpaceX Dragon 2 vehicle to the International Space Station,” SpaceX says, using an older name for the vehicle, in its instructions for the simulator available here.

The simulator shows parameters such as distance, roll, pitch and yaw, along with green numbers that show corrections that are necessary to reach the space station. (A successful docking will occur when all the displayed correction numbers are below 0.2, SpaceX says.) Also watch for blue numbers, which are the rates (or speed) that you are translating or rotating in space.

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When flying, aim for the green diamond that is marked on the docking adapter. As for real astronauts, SpaceX says it is best to be precise in your movements and not to make large, sudden moves — just in case you miss the space station completely or accidentally crash into it. SpaceX advises that when you are less than 16 feet (5 meters) from the space station, keep your rate below minus 0.6 feet per second (minus 0.2 meters per second), as measured by the internal display.

Read more: Space